The glowing head of a comet is known as the

It's called a coma! (:
Something interesting about a comet is that it basically has four parts -
a nucleus, a coma, a dust tail and an ion tail, and the plasma tail of the comet is extremely hard to see by the human eye!
I hope all is well, and you pass! Good luck, rockstar! (: If you need anymore help, or even have any comments - let me know! (:

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